The AHECC is used in the preparation of export documentation and in the compilation of Australian export statistics. The classification is arranged in five sections: introduction and explanatory notes; codes, abbreviations and summary of the AHECC; detailed export commodity classification; key of changes between export statistical items; and alphabetical index to the AHECC. The AHECC is a dynamic classification with any necessary changes being implemented on 1 January and 1 July of each year.